A#2-B2. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 21. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 172.

            Bb-tr
x x x | x tr o
   w

A#2-B2. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 172.

Cooper p. 51 uses the R. H. thumb Bb.

            Bb
x x x | tr x
   w
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Heckel-System (German) Bassoon Trills and Shakes by Note Names